Dont let your birthday dictate your hardware shopping!....
i just cant understand people who buy last gen tech unless its the high end last gen tech. in your case it would mean a gtx275 or hd4870/90.
You are out of the dx11 game, no tessalation (among other things) for you in any games (imagine settlers 2 like game with cozy huts with tesselated roof.. etc.etc..)